False tooth



' G. W. TOFT May 12, 1931,

' FALSE TOOTH Filed Aug. 8. 192a INVENTOR. GEORGE W 7'01"?- BY MM #6 A TTOR NE Y5v I 50 The groove hasan enlarged portion 4: and

Patented May 12, 1931 r UNITED STATES PATENTo FicEf GEOR w. Tom, on MOUNTAIN view, CALIFORNIA v rnrsn 'roorn Application filed August 8,

i or slot in the porcelain tooth and sliding a key carried by the plate into the groove. The groove is relatively deep, because the top of the groove is reduced for providing lips for engaging with the neck of the key, and these lips must be thick enough to secure the tooth to the plate. The tooth is very likely to crack along the line coinciding with the slot.

The principal object of'the present invention is to provide a tooth inwhich the groove is far more shallow than'the standard one now on the market, and in which a more permanent connection is made between the tooth and the supporting plate. The shallow groove provides a stronger tooth, and

therefore such a tooth will not crack so readily.

Other objects and advantages will appear as the specification proceeds, and the novel features will be particularly pointed out in what I hereinafter claim.

My 'invention'is illustrated in the accompanying drawing forming a part of this application, in which r Figure 1 's a plan view looking at the inner face ofthe tooth;

Figure 2 is'a section along the line 22 of Figure 1 showing the plate in position; Figure 3 is a side elevation of .the tooth showing itoperatively applied to the plate;

and

Figure 4 is a perspective viewof the plate and key. r

In carrying out my invention, I show a tooth A, a plate B, and a key C. The tooth A is shaped to resemble an ordinary tooth. The inner face 1 thereof is smooth and is providedwith a groove 2 that extends downwarclly into an inclined face 3 of the tooth.

1 92s. SerialNo. 298,327.

an opening smaller in width than the por- 8 tion 4. This provides lips 5 that are very small. These lips extend the entire length of the groove and engage tion 6 of the key 0.

with the neck por- The key has an enlarged portion 7 that is snugly received in the portion 4 of the groove. The key is secured to the plate B by any means (not shown) The thinning of the lips 5 does away with the necessity of having the enlarged portion 4 extend so far into the case where thick lips. are provided. Up.

tooth A as is the to the present time, thick lips have had to be provided in orderto give the procelain forming the lips the necessary body struc ture to withstand the strain. In the present invention I use thin lips for the porcelain and reinforce these with pins 8 or other suitable reinforcing means.

Figure 1 shows these pins as being staggered, but it is obvious that they can be disposed opposite each same plane without departing from the other and in the spirit andscope of my invention.

Figure 2 shows how the pins extend into the. body of the tooth and how these are provided with recesses 9 for receiving the enlarged portion 7 of the key. The inner ends of the members 8 may be enlarged as fat 10 for aiding and anchoring the members.

As many members as is necessary may be provided. The drawing shows two.

From the foregoing description of the various parts of'the device, the operation thereof may be readily understood.

The plate B is anchored in place in the usual 7 manner, and then place by cement.

the false tooth is slipped down over the key C and is held in V The amount of porcelain between the bottom of the groove 2 and the the tooth will have less plate because these lips the members 8. In fact, the membersuS face 11 is relatively great, and therefore tendency to split along the groove thanis now the-case. The

are reinforced by do practically all of the connecting between the tooth and the plate,

acting as guides.

the lips 5 merely The pins in the porcelain permit making the groove and neck portion much smaller than Without them, thus giving greater bulk of porcelain over the groove. The inherent strength of the pins prevent breakage at the neck portion.

The pins in the porcelain are to be as small in bulk as possible, yet large enough to give the required strength. Any metallic element has a tendency to weaken porcelain in proportion to its bulk and in the direction of its long axis. Hence the pins may not necessarily be placed directly opposite each other.

Although I have shown and described one embodiment of my invention, it is to be understood that the same is susceptible of various changes, and I reserve bzlu right to employ such changes as may come within the scope of the invention as claimed.

I claim:

1. A false tooth having a groove and reinforcing pins extending tr nsversely to the groove and being embedded in the tooth, the pin disposed on one side of the groove being staggered with respect to the pin on the other side. 7

2. A falsetooth having a groove on its inner surface, the groove being enlarged inwardl T for forming thin lips, and metal pins em edded in the tooth and extending transversely to the groove, said pins having recesses conforming to the enlarged portion of the groove, said pins being staggered with respect to each other.

3. A false tooth having a groove. on its inner surface, the groove being enlarged inwardly for forming thin lips, and metal pins embedded in the tooth and extending transversely to the groove, said pins having recesses conforming to the enlarged portion of the groove, said ,pins being staggered with respect to each other, and a plate having a key receivable in the groove, said key having a crosssection similar to the cross section of the groove.

I. A porcelain false tooth having a longitudinally extending groove with thin lips projecting toward each other, and pins disposed on each side of the groove and being embedded in the tooth for reinforcing the lips.

5. tudinally extending groove with thin lips projecting toward each other, and pins disposed on each sideof the groove and being embedded in the tooth for reinforcing the lips, the pin disposed on one side 'of the groove being staggered with respect to the pin on the other side.

6. A porcelain false tooth having a longitudinally extending groove with thin lips projecting toward each other, pins disposed on each side of the groove and being embedded in the tooth for reinforcing the lips,

A porcelain false tooth having a longithe groove.

GEORGE W. TOFT. 

